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The difference between the “all-in” price and the LME spot price is referred to as the “premium.” A company called Platts calculates something called the Midwest Transaction Price “based upon what is described as ”a daily survey of spot buyers and sellers, using a representative sample of producers, traders and different types of end users.’” According to plaintiffs, “[u]sing this survey information, Platts calculates a single price for the metal” -- an “all-in” price